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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbf77a4f5ddbdde7b75ba230c1950dd2a0cd4d06ceb76f53658a98a8d1f6483c' 
  AND token = 'JOmxKCpqUyRH2C24Z3UeFYfjck867F35gHpUAJgOt+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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