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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b46a1ce59c650b3a40dd89bf7fbd0e9f0962e941eb0d41ef3580ffd8b638312e' 
  AND token = '1Kmnk8tYyNAGXyKF6yqQtFqzRok2mka+uyi7xbeE5nI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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