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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10ffb1a66e9edb57bb43707bb90bf8413a177fdc90adf117f6570fc68185baba' 
  AND token = 'cm/V9RoU6rA29fGBh29ZYtIILC1cR6kqN9jIZAmeUF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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