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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '020ac09046ac82a147d7fde39d55acb448537a1df6f322ab213ead9efcaf0e03' 
  AND token = 'B5KvgU/OZEvTPyVHaqhap9D9S/cLLuK7QEkA3I26csg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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