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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94c26b6c4b8145f1f06bc829e55df051b1d60464912e7a8f406ce3df01c4430a' 
  AND token = 'S5D5c65FJ4NgeEi8YEyOLWzCL5YZ3MmLhCEq3G9XhGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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