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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'baa2ffc11737c2853f388b0983716a09da8aa8263e6e417ac66e0afbc5b4c8cf' 
  AND token = 's5ybVm2bhiDLrGmw56OBYZwMAtWPzDTkKaWG8uacVt0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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