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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c27dc12e819df6b509f759934bc2f5c247e0def7d8831c7f0b38ebaf0549776' 
  AND token = '2p8woSiA+9K99zIsGMIr9DsDZLjYTajArimIrxGB1j0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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