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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1619e5b0699b6a82ff2815ebddc082d754de46da7b695fa23bd112e31377f74d' 
  AND token = 'ESGrW0CJQHXI3fC42d6G5o42u2+ZIiaHAoing1HudME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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