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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7db03a0ea1644d084871f2b67d19134b3e5af944107e245918b793ad4f23c32d' 
  AND token = 'zU1P6Kr7ih824jSoW7xm0J7auGF7O5eT+o8kd1QrGZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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