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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47e5cab4b556abb8cc1397536cefdf5e70fc41243d34efa4d1cd87f5b2edc9c6' 
  AND token = 'k4mIS+DdO4pRsVobr1MirNdDf/bSW/zZOBMYl+EHPHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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