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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67cdeb123de489385bfe342768d3f92c58aa93580b26c6c2b98dd8b33a3e8e37' 
  AND token = 'kDBFmvqgt6/Kqcjp/OF5OB+e7/Mz06xct5LY7stopCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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