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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19539b63bb28d68044884950f171bb7267717156a33143230d11f8eab91fce75' 
  AND token = '1+8a8gVDLAQQZMGZP1ePW+/CHlG8l/Ao03jCiA/ZJgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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