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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9947ff1f35408c771f5e406abd20ac7b5911f41c66ec9ebb4e229164c9811fb' 
  AND token = 'gwDMWLnIG1boRzHcbh/q17esRLWlHjEzq567q653Tqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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