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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebee38e67823766b6d9463ff727a78d4d5402db51754da85cd8e3f1f7c582d7a' 
  AND token = 'bMvxDPgK/Tl6aO7Vt1vYNC9YJEaNRs+GPe6Y8ctbgN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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