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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8d0c1547a39ff9889defb302af8b15972b66ccefdd386ac8fd146e1099ded9e' 
  AND token = 'pv/dYwUyulvWwIo4TZDGwZOjuXI3V11/Zwgy8WM5kuA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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