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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b500233554d0d44291a93b1c4b7564dff0faa9a61d286e31e76887325e59e73' 
  AND token = 'taocUVV+r5P86yTLEowgvD4tm7gQxDQ9/4tL+NNxrn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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