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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1a9890359b5bc65be32cabc0aca98f30d34f3d9a49618da1aed0aae8323fd81' 
  AND token = 'bJ+qXlmQ+Z2vX03ho5YEwvU2E2IaXXwBaYdMBNmxmzo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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