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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1f5e9808228092f8991859f22aa82c74a6866224537987974bea3fef3671365' 
  AND token = 'WaA1IFaocwJfoakCDXIVODHo6fClT10083qf0U4i5t0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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