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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a34067a934b8e506bbeb452193c41c7b95152d9586974ec74f2bd4463a8ca5b8' 
  AND token = 'jGDSjSYGjxKAGjPy2OiwyTFuFUtYKm7lKIfo0YE98uk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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