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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'daa135d57cbe29216240a6a2531fca88a60b5e5b2ea996df0a22b9fb22e62c44' 
  AND token = 'UTn85H4lPSwekZTicJzGDZcFwr0uaOwZ6C+TZuwNEq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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