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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5d1d7a1db831d8d3d1e541e10041c88a64924124b646dd42f7d0bc35a5d89fc' 
  AND token = 'KYwSBFn8gw4YwRXYIXr1vvG523E9urhrSzSOaK5SdOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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