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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ceb6dd760854eb1ab4b52d4b8bd115850f61fce4f8dee0bb9bc2751b23b1360b' 
  AND token = 'S0YRx8SmQbtZJfN5PWVzKADbfVgd6stYGfXrNcAsSoM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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