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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e159bc3e7845a368f852682d60894a99636b28376bedbc5bff322172515e2b6d' 
  AND token = '4AbheuAq4dvQNJC6o/i3goXOwOvthygFfEyTaLywmi8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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