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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '639d4e3e182986ac31630e3ac8d3185a45e9f58ac435e440fd91b752febd8fa9' 
  AND token = 'wqqLQKWfzFwk4cIBhZmQC3VXyP4huVLMbDXKT3V9RMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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