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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24f1dab6ee2c623f14581d7d84b8ae30097e860e9b099c90c38db609bb39d52d' 
  AND token = 'FoCwfL62EDnCk0l/R0QykSN57XNs389DOtX4Njt6SbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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