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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7ee9a667c880ab9e5efe290d486b56b5d8c2ad80ae63d55f562153231d8e669' 
  AND token = 'njD0I2yxBsdTydbGPMxFZ/heC56Zwn/heJmvjSc5StI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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