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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '867bc0410864827915f9b5daf074f4880f9d6a513d4333cb6d0b46077358a79e' 
  AND token = 'NTy5gx4lOPiPdXNrgTBYE9Xwbhs6AIm8V8Ksy6wJgRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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