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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f80a40a8e0e844a798787620ab8d0a18fc2d346eceed31a4889ce66e6db47a93' 
  AND token = '8faYAVSmX8t6Y0ywOSpQWHz542765SzzD5RWq+PzSgY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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