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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffb432cbc54689965116b7df5d56f656dcc937d33cee54b17d1b6bdfa9ab10ab' 
  AND token = 'WHRBm7JU581Ea9DFQrQOOdVwxwTN6Dd8jleUNIAumgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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