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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90a0208bfca8a0820918c29af098280fd7fac43eb0f654c2e309b4c0c08a502f' 
  AND token = 'hLgbtCbvRtMixmVPyknd53R3ID+/D8TaaVVue2jNBNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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