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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '037da120f359546c41c1e96b8ad6a5be9dd3e3d05de43ab8c11aa84390ed8761' 
  AND token = '2nvV237pCOBH7rSMKeoUtXwFfSM3v4ACmUy+DOY5J48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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