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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c045a4f9df262715a518b174e2653576fe29569df20156ecab20ec41b83579ff' 
  AND token = '6DzEQJjWnNR5ApF3/WOM3qVf9I2QG1TolEoV7PTexvI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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