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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73a3a80e95e706fee2f79ca3454ee16f3de75c7ca670e977ccda2765744e3bb0' 
  AND token = 'IoJ1ECwwJC20elIVqB3MbPCBV2U4v+Dr2S5aALSFto0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00073

JSON explain

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