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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '418b8ec2bf94ed9ee045f16c9f57cf844b1f45bf18f8822ce24fd6a42695420c' 
  AND token = 'WC/PymrCrisY2bq75CfmkVT+pXJ/R1PEzd7loi+5IYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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