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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81140aaa3b03aadb6caa9daf1b508219d4d332c10a1e6a4af14c2d20353c6517' 
  AND token = 'FmtyqQ/c9Vf1cVzYEdjkA2OjG3UcLEb09e7nEsI5Un8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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