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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93e9ff260368299fbbaec0a268b4e663cbe574713cc0e6a8922f802bcef470f2' 
  AND token = 'eyKJthsPa8P0mC97/CCCx8vkXa7HaedJeKRlTjw6rDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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