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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32df83bd854fa381c12cb7b13f7f3abe3b67e6983dbf3d984e8e9c27dfacabb2' 
  AND token = 'equQ5zKbKKtJpBkMEnJxyL3JVZxqFVDYo+EYiLIevOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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