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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e322a69db116ec48e5eefcb0f81b9561a276fb7e94622d9786ed3a9941f2a69b' 
  AND token = 'ahpvds7+6nao16eneDKtUzAOIj2tzQCxWiFgKo1jRgs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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