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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d69c04f7f2c231c51dd11273e2fcfacc39b5a08c534fdc88eb1b7c740eb6b57' 
  AND token = 'qvGQ0UftIM6gJ8AQ4m1oqGg4Wk6524HvNvl99K+v7Mc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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