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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd2c8a34a9ee78752b342e170f05079624422bf6241b3681aa97f1edff8e8c50' 
  AND token = 'd8eSfyubDzySfkKOFQzXEymK3mrgzRslt1BNDK3vvyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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