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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93773d9704247334f09a29a379ac285379d01336733020262a2d4fa9720e31e7' 
  AND token = 'jnPuf4N7Pwd4zHe8AmeZ0wYVd+wGj3fHHvrhQa0hJ4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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