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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '299830db0609dd7342c92f5c80cf6dab90e395f522bbfcf043b4f9e229550915' 
  AND token = 'uEzEq1DCNKExGGjFaHPGdKbuL9Osftx/wmzDZbu30LI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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