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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a9a0bbee1e204dd7697aec274f202c250f2b6120586ef61e19e554ba782c3eb' 
  AND token = 'uTZEl7yBGvaw+p/HkXVjwjb9N3Q+xXCqArETz9csM7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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