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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c05f32e38dbbee7402737645b67888b8fb861b3849ad0d34c5bdc4d6ac613bd' 
  AND token = '2k/H1Rzi0Fo5Hf5NAH/4K/sO2qAWULADfNpNP8+XeSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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