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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31e23d27a77d68b8ec9e3c4c797b44071d2fbaa4f937a4af67895b5ab28375e0' 
  AND token = 'CnqUzkfwsp7Eg2UBD4Meww+8UFJX2D9zcl8AgIGkIX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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