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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f148ae33e38354ae8a6c20ddf4537fdc9b4f5fb38824f6a818e3d539e97185be' 
  AND token = 'sSnVwVowVNAQNb6PYkTQRhRTI4lNYxWyqSOxqcmyPeg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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