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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47de205238752de9906a484d5243ff5980c755ce89838ffa5e45d049b7c9fe3e' 
  AND token = 'lhQ8ovjPQ5yk8esaukB3mtDRkct1o41GCtX05yx7xrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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