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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd7a5bee006c9f6d74e6047241810cd4dbe7021e1260ae7ac41bf8bad1f29dfd' 
  AND token = 'pbBzcDAegWMskKYfKtJpbCW3sHy3tibWTF6cBhP6ThE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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