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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c62fd76ae9189c980f738b684a06b41a6993cf22aee8b2544246d4e2595eab77' 
  AND token = 'fjXSqcCjaQmP9/NQ8Unsy4mRy0Y+oGh4kRKo7kpjWZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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