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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f06fbd44e531a775dea181b20806febba1eaf5e03616978c78e48bbbd4beeb8' 
  AND token = 'kMp3TYVUud0PRiuPSzI7PY5c0tt4BydIxwcEPZ7DOOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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