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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f93fc7ba677e821d140850691d40b3ec726ccc47bfb4669905986a1dd196a8e1' 
  AND token = 'aK8P6edbLdaU7lvo5iAvQOccRks40+h9g/366yNeR/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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