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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4a2f6dcfaa1fca94cd83124f761c98302b71163cec51b682d18dfa09f42ea6b' 
  AND token = '1583BGcWreoZLj/bPafCD5Lxuea2/YgUDN6rH/scIfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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