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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d1c671eb2c943c6ebfffb5a9c816f94e141981247832dbe278867ec1e23fe47' 
  AND token = 'kMb7Jx3oeoIkk1rjK6UtvsAL56ICDctXlK73xkv6gw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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