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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '481c0ddd52ec8fe95af01fdb69e59bb3a18e91474b526b7f37f0a1bc3165d408' 
  AND token = 'z5B2QNipPLDh4LkHpbJyyfIZ9ZViArY4yRhLzGUY2OM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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