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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64a07b389a523192a9ec86ae71d73932adb9e65c97dd26f1e07d138c40bffdde' 
  AND token = 'amGmtH+e5UcC/26FKO7s3utgo0rJkcmABMomvp+XZuA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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