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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7518d266034bad02fd1b3460ab2bc05a9e9644f56905b559e21e64ed23de601' 
  AND token = 'tBUMJNpOxYVJL0VuCtbyLQr2CQtqxbbobASi//6sqlw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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