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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '430736a7f5e7f6224a9d9a4ed572bda853a4953f1bc6c2167d68a77d28f8d252' 
  AND token = '1h7f5K3pJQ7gEmRQhnnrPrAgmadDfq1ECc98UYJaEwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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