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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98ee0c240dbb0400630bb2ac1cd806b6976eda205a0eb609f1be8af9629be6fc' 
  AND token = '296RysRphHAD0sEmdHyYyHH5HvSsg78PG3AV7ltmd+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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