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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '083bf77e6a43476f35881890a5c5fe61353cfa22e2bd9b339fc9f7c08180b977' 
  AND token = 'hPiipxoGyAfa5DFRPRA5TtNNBLutfpdn/kuHX5z2z3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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