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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b54cb0b096521ebe8aca6b735824e7a606f5996f7c0c1b69656b5a90f00bfa76' 
  AND token = 'zc4HQh0D2Y557EfErJEz39lSFUTJgVFo6yXnSZvhZ44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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