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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32a0a475d99a84d23ca620e389c0316b900144250425d0270201a3ba8cc56f96' 
  AND token = 'tJSJETLOc/7vuMpNhr2jO2HMnYPEvUQ7kzfYy1Nm7nI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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