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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a7adb841a70d3e7073313dd411a8ecf4e7ae194a32d92d14c5bc25e69671f4f' 
  AND token = '3Qliv+E8CpnocnWuPFdUnjMctsG72wxmQOk0Sv6Vku0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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