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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6587756c07ccee99da9a2ac15ba7ab3a2349df125fb9c12f4cce4386f7c406e8' 
  AND token = 'KAn29x1mopCBHYBxjEWbwOPgJ40ttmyHJm6Q44Z3Q0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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