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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ea19026820ed8e584bd099ff95fde6903a183f3f3d68c8333ce8dbcc87d4d21' 
  AND token = 'ZW0Nv27ji8Wiunevjk7ssJqYU3E1z9izpwHtlKGBpow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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