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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcf036f972c82404d1ccc8d4332af68913e363711ce0040f41299708fd748080' 
  AND token = 'AD96R3NeryN5nBbVC6+97KIByR85sd/S2+4idRD9DqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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