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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14cb6a98c6a942ea5128719a45c3c6143949b5fe55b36482ca8e11345c8f6c46' 
  AND token = 'fnv3vRPdSzfx4EMmHAgMbtfneUBDT7TvVsn5Dq9y/BE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}